[PSUBS-MAILIST] Motor Issue

[Alan James via Personal_Submersibles]

 James, all I can think of is that one of the bearings is not quite right and causes a vibration that is making that noise & causing the brushes to wear excessively. Alan 
    On Monday, July 19, 2021, 11:23:56 PM GMT+12, James Frankland via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hi All
Does anyone have any ideas on this?
Following the dive i did last week, i had a motor issue.  The motor did not actually stop or fail, but during the dives it just didnt feel right.
The positive wire going into the rotating penetrator would get hot after about 10 seconds of motor power.  I could also hear a kind of electrical noise from within somewhere.
So, the next day i took the motor apart.  The oil (Silicone oil) was VERY black.
I was expecting to see something had been rubbing, but i couldnt see anything.  It all looked fine.  
I put it all back together and it runs fine in air.  However, there does seem to be a louder motor running noise than the others.
I am unsure what the issue is.  My feeling is that its carbon in the oil, making it conducting and hence slightly shorting out, causing the heat on the cable.
The other motor cable did not get hot, nor did the oil go black.
Again, another video here.  https://www.youtube.com/watch?v=v_VxVfhM9t8&t=2s
Would appreciate any input.  Im not sure what to do.  Buy a new motor?  Air compensate it?
Many thanks
James

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